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LCYK Arkusz danych(PDF) 7 Page - Linear Technology

Numer części LCYK
Szczegółowy opis  36V, 3.5A, 2.4MHz Step-Down Switching Regulator with 75關A Quiescent Current
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Producent  LINER [Linear Technology]
Strona internetowa  http://www.linear.com
Logo LINER - Linear Technology

LCYK Arkusz danych(HTML) 7 Page - Linear Technology

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LT3680
7
3680fa
BD (Pin 1): This pin connects to the anode of the boost
Schottky diode. BD also supplies current to the internal
regulator.
BOOST (Pin 2): This pin is used to provide a drive
voltage, higher than the input voltage, to the internal bipolar
NPN power switch.
SW (Pin 3): The SW pin is the output of the internal power
switch. Connect this pin to the inductor, catch diode and
boost capacitor.
VIN (Pin 4): The VIN pin supplies current to the LT3680’s
internal regulator and to the internal power switch. This
pin must be locally bypassed.
RUN/SS (Pin 5): The RUN/SS pin is used to put the
LT3680 in shutdown mode. Tie to ground to shut down
the LT3680. Tie to 2.5V or more for normal operation. If
the shutdown feature is not used, tie this pin to the VIN
pin. RUN/SS also provides a soft-start function; see the
Applications Information section.
SYNC (Pin 6): This is the external clock synchronization
input. Ground this pin for low ripple Burst Mode operation
at low output loads. Tie to a clock source for synchroniza-
tion. Clock edges should have rise and fall times faster
than 1μs. Do not leave pin floating. See synchronizing
section in Applications Information.
PG (Pin 7): The PG pin is the open collector output of an
internal comparator. PG remains low until the FB pin is
within 9% of the final regulation voltage. PG output is valid
when VIN is above 3.6V and RUN/SS is high.
FB (Pin 8): The LT3680 regulates the FB pin to 0.790V.
Connect the feedback resistor divider tap to this pin.
VC (Pin 9): The VC pin is the output of the internal error
amplifier. The voltage on this pin controls the peak switch
current. Tie an RC network from this pin to ground to
compensate the control loop.
RT (Pin 10): Oscillator Resistor Input. Connecting a resistor
to ground from this pin sets the switching frequency.
Exposed Pad (Pin 11): Ground. The Exposed Pad must
be soldered to PCB.
+
+
OSCILLATOR
200kHzTO2.4MHz
BurstMode
DETECT
VC CLAMP
SOFT-START
SLOPE COMP
R
VIN
VIN
RUN/SS
BOOST
SW
SWITCH
LATCH
VC
VOUT
C2
C3
CF
L1
D1
DISABLE
CC
RC
BD
RT
R2
GND
ERROR AMP
R1
FB
RT
C1
PG
0.7V
S
Q
3680 BD
4
5
10
7
1
2
3
9
11
8
6
INTERNAL 0.79V REF
SYNC
BLOCK DIAGRAM
PIN FUNCTIONS


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